There's a very helpful site that tells you how to do this for your router. It even has pictures to show you how it's done. Just go to portforward.com and look up your router by model# under port triggering. Do what it says, setting up an entry for each of these ports: 80, 443, and 667. When it asks you for TCP or UDP, use TCP.
If you are unable to find your router on the site, go to your router's manufacturer site and search the support section under your model# for information on port triggering. There's almost always something that shows you how.
Doing this will help with any firewall issues with your router that may cause it to disconnect the game, which may help some of you. It is a common cause for disconnect problems with wireless gaming. Some routers also need to have the MTU adjusted if the triggering alone doesn't work or turns out not to be the issue.
If you need help, ask for it in the Technical Support forum. Sometimes it's not the game or your computer, it's your router - and you won't know until you give it a try
It can make your game time a whole lot better!